GCSE Secondary Maths Age 13-17 - Geometry & Measures: Isosceles Triangles - Explained

The video tutorial explains how to prove that a given triangle is isosceles by demonstrating that it has two equal angles. The teacher walks through the problem, starting with a diagram and identifying key angles. Using properties of vertically opposite angles and the sum of angles in a triangle, the teacher calculates the necessary angles to prove the triangle is isosceles. The tutorial emphasizes the importance of providing reasons for each step and concludes with a breakdown of how marks are awarded for the solution.

What are the defining properties of an isosceles triangle?

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What is the significance of vertically opposite angles in proving triangle properties?

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How do you calculate the angles in a triangle, and what is the total sum of the angles?

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What steps did you take to find the size of angle C in triangle ABC?

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Explain how you can prove that triangle ABC is isosceles.

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